In his awesome classic The Visual Display of Quantitative
Information, Edward Tufte presents this infographic:

Tufte says "Here five colors report, almost by happenstance, only five
pieces of data (since the division within each year adds to 100
percent). This may well be the worst graphic ever to find its way
into print."

Unfortunately the standards of the Internet can be even lower than
those of print, as exhibited by this infographic, produced by Pingdom:

This infographic outdoes Tufte's example: it reports not five but four
pieces of data.

Chapter 6 of Tufte's book, "Data-Ink Maximization and Graphical
Design", explores the exercise of erasing all the ink from an
infographic that does not perform the function of communicating data.
If we were to take this a little farther, and replace the original
80,265-byte graphic file with the 32 bytes of numeric data that it was
designed to communicate, we might conclude that the image contained an
astounding 99.96% chartjunk.